A shape has 2-fold rotational symmetry. By what angle must it be turned to look the same again at the first position?
Answer and explanation
Correct answer: A. 180 degrees
- Step 1: A full turn is 360 degrees. Step 2. 360 / 2 = 180 degrees. Answer: 180 degrees. Why not the others: 120 degrees: the angle was calculated for the wrong number of positions. 360 degrees: this is a double turn. 2 degrees: the number of positions was used as the angle.
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